package com.example.dingsheng.musicui;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.Toast;

/**
 * Created by dingsheng on 2017/10/19.
 */
public class MusicService extends Service {

    //播放控制命令，标识操作
    public static final int COMMAND_UNKNOWN=-1;
    public static final int COMMAND_PLAY=0;
    public static final int COMMAND_PAUSE=1;
    public static final int COMMAND_STOP=2;
    public static final int COMMAND_RESUME=3;
    public static final int COMMAND_PREVIOUS=4;
    public static final int COMMAND_NEXT=5;
    public static final int COMMAND_CHECK_IS_PLAYING=6;
    public static final int COMMAND_SEEK_TO=7;

    //播放器状态
    public static final int STATUS_PLAYING=0;
    public static final int STATUS_PAUSED=1;
    public static final int STATUS_STOPPED=2;
    public static final int STATUS_COMPLETED=3;

    //广播标识
    public static final String BROADCAST_MUSICSERVICE_CONTROL = "MusicService.ACTION_CONTROL";
    public static final String BROADCAST_MUSICSERVICE_UPDATE_STATUS = "MusicService.ACTION_UPDATE";

    //歌曲序号，从0开始
    private int number=0;
    private int status;

    //媒体播放类
    private MediaPlayer player=new MediaPlayer();

    //广播接收器
    private CommandReceiver receiver;
    private boolean phone=false;

    @Override
    public void onCreate(){
        super.onCreate();
        //绑定广播接收器，可以接收广播
        bindCommandReceiver();
        status=MusicService.STATUS_STOPPED;
        TelephonyManager telephonyManager=(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);
    }
    private final class MyPhoneListener extends PhoneStateListener{
        public void onCallStateChanged(int state,String incomingNumber){
            switch (state){
                case TelephonyManager.CALL_STATE_RINGING:
                    if (status == MusicService.STATUS_PLAYING){
                        pause();
                        phone=true;
                    }
                    break;
                case TelephonyManager.CALL_STATE_IDLE:
                    if (phone==true){
                        resume();
                        phone=false;
                    }
                    break;
            }
        }
    }

    @Override
    public void onDestroy() {
        if (player != null){
            player.release();
        }
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    //绑定广播接收器
    private void bindCommandReceiver(){
        receiver =new CommandReceiver();
        IntentFilter filter=new IntentFilter(BROADCAST_MUSICSERVICE_CONTROL);
    }

    /**内部类，接收广播命令，并执行操作*/
    class CommandReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            //获取命令
            int command=intent.getIntExtra("command",COMMAND_UNKNOWN);
            //执行命令
            switch (command){
                case COMMAND_SEEK_TO:
                    seekTo(intent.getIntExtra("time",0));
                    break;
                case COMMAND_PLAY:
                    number=intent.getIntExtra("number",0);
                    play(number);
                    break;
                case COMMAND_PREVIOUS:
                    moveNumberToPrevious();
                    break;
                case COMMAND_NEXT:
                    moveNumberToNext();
                    break;
                case COMMAND_PAUSE:
                    pause();
                    break;
                case COMMAND_STOP:
                    stop();
                    break;
                case COMMAND_RESUME:
                    resume();
                    break;
                case COMMAND_CHECK_IS_PLAYING:
                    if (player != null && player.isPlaying()){
                        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
                    }
                    break;
                case COMMAND_UNKNOWN:
                    default:
                        break;
            }
        }
    }
    //发送广播，提醒状态改变了
    private void sendBroadcastOnStatusChanged(int status){
        Intent intent=new Intent(BROADCAST_MUSICSERVICE_UPDATE_STATUS);
        intent.putExtra("status",status);
        if (status!=STATUS_STOPPED){
            intent.putExtra("time",player.getCurrentPosition());
            intent.putExtra("duration",player.getDuration());
            intent.putExtra("number",number);
            intent.putExtra("musicName",MusicList.getMusicList().get(number).getMusicName());
            intent.putExtra("musicArtist",MusicList.getMusicList().get(number).getMusicArtist());
        }
        sendBroadcast(intent);
    }

    //读取音乐文件
    private void load(int number){
        try{
            player.reset();
            player.setDataSource(MusicList.getMusicList().get(number).getMusicPath());
            player.prepare();
        }catch (Exception e){
            e.printStackTrace();
        }
        //注册监听器
        player.setOnCompletionListener(completionListener);
    }

    //播放结束监听
    MediaPlayer.OnCompletionListener completionListener=new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            if (mp.isLooping()){
                replay();
            }else{
                sendBroadcastOnStatusChanged(MusicService.STATUS_COMPLETED);
            }
        }
    };

    //选择下一首
    private void moveNumberToPrevious(){
        //判断是否到达列表顶端
        if (number==0){
            Toast.makeText(MusicService.this,"已经到达列表顶端",Toast.LENGTH_SHORT).show();
        }else{
            --number;
            play(number);
        }
    }

    //选择上一首
    private void moveNumberToNext(){
        //判断是否到达列表底端
        if (number==0){
            Toast.makeText(MusicService.this,"已经到达列表底端",Toast.LENGTH_SHORT).show();
        }else{
            ++number;
            play(number);
        }
    }

    //播放音乐
    private void play(int number){
        //停止当前播放
        if (player != null && player.isPlaying()){
            player.stop();
        }
        load(number);
        player.start();
        status=MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
    }

    /** 暂停音乐*/
    private void pause() {
        if (player.isPlaying()) {
            player.pause();
            status = MusicService.STATUS_PAUSED;
            sendBroadcastOnStatusChanged(MusicService.STATUS_PAUSED);
        }
    }

    /** 停止播放*/
    private void stop() {
        if (status != MusicService.STATUS_STOPPED) {
            player.stop();
            status = MusicService.STATUS_STOPPED;
            sendBroadcastOnStatusChanged(MusicService.STATUS_STOPPED);
        }
    }

    /** 恢复播放（暂停之后）*/
    private void resume() {
        player.start();
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
    }

    /** 重新播放（播放完成之后）*/
    private void replay() {
        player.start();
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
    }
    private void seekTo(int time){
        player.seekTo(time);
    }

}
